Our team reviewed 18 flat roof contractors serving Longwood and Seminole County, FL between January and July 2026 to identify the most qualified firms based on flat roofing expertise, certifications, and documented local performance. We rank-ordered each company using the following criteria:
- Flat Roof Certifications (30%): The most reliable indicator of flat roofing competency is a contractor's manufacturer credentials and verified training in membrane systems. We weighted this category highest because certifications such as Owens Corning Platinum and GAF Commercial require demonstrated project quality and ongoing audits, not just enrollment.
- Local Track Record (20%): We reviewed each contractor's documented history serving Longwood and Seminole County, including years of continuous local operation, permit activity, and verifiable project volume in the area.
- Flat Roof System Variety (15%): Contractors who install multiple membrane types (TPO, EPDM, PVC, BUR, modified bitumen, and liquid coatings) can recommend the right system rather than defaulting to a single option.
- Customer Review Score (15%): We aggregated ratings across GuildQuality, Directorii, Google, and Best Pick Reports. Review scores across platforms reflect installation consistency over time, not just individual project outcomes.
- Years in Business (10%): Florida roofing codes, storm patterns, and membrane materials have changed substantially over the past two decades. Longer operating tenure indicates the ability to adapt and sustain operations across market and weather cycles.
- Warranty Strength (5%): We scored each contractor on whether they can offer manufacturer-backed warranties, including platinum-tier and no-dollar-limit (NDL) coverage, rather than a workmanship-only guarantee.
- Service Breadth (5%): Contractors who handle flat roof repair, replacement, maintenance, and storm damage under a single point of contact reduce coordination complexity for property owners.
The table below shows the full breakdown. Scroll sideways to view all columns.
The Best Flat Roof Contractors in Longwood, FL of 2026
Scroll sideways to view the full table.
| Rank | Company | Flat Roof Certifications (30%) | Local Track Record (20%) | Flat Roof System Variety (15%) | Customer Review Score (15%) | Years in Business (10%) | Warranty Strength (5%) | Service Breadth (5%) | Overall Score | Specialty |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Collis Roofing | Platinum-Tier | 9.4 | Full Range | 9.6 | 8.8 | 9.2 | 9.4 | 9.5/10 | Full-Service Flat Roofing |
| 2 | All Roofing & Construction | Strong | 7.2 | Broad | 7.8 | 5.5 | 7.0 | 7.6 | 7.7/10 | System Selection |
| 3 | 3MG Roofing | Elite-Tier | 4.8 | Broad | 9.6 | 5.2 | 7.8 | 6.8 | 7.5/10 | GAF Commercial |
| 4 | Evans Roofing Central Florida | Licensed | 8.9 | Narrow | 8.6 | 9.8 | 5.6 | 7.4 | 7.2/10 | Residential Low-Slope |
| 5 | Northmen Roofing | Specialty-Tier | 5.4 | Restoration-Focused | 8.6 | 4.6 | 8.2 | 5.8 | 6.9/10 | Restoration & Coatings |
Contractor Summaries
1. Collis Roofing, for Full-Service Commercial and Residential Flat Roofing
Collis Roofing is Florida's largest residential roofer, family owned and operated since 1994, serving homeowners and businesses from Tampa Bay through Orlando, Melbourne, and Jacksonville. Headquartered at 485 Commerce Way in Longwood, Collis Roofing brings more than 30 years of Florida-specific roofing experience to flat roof work across Seminole County and the surrounding region. Their commercial roofing work includes flat and low-slope roof repair and replacement across Florida markets, including commercial flat roofing systems such as GAF TPO. Collis Roofing offers fully adhered and mechanically adhered commercial roofing. As an Owens Corning Platinum contractor and GAF-certified roofer, Collis brings the manufacturer credentials, Florida-specific experience, and warranty support behind its "roofing done right" reputation.
With more than 1,558 verified reviews on GuildQuality averaging 4.8 out of 5 stars, and 1,435 out of 1,520 customers stating they would recommend the company, Collis Roofing carries a volume of documented customer proof that fewer competitors in this market match. Four Florida branches serve 19 counties, giving property owners access to trained local crews and warranty support throughout Central and Northeast Florida. Collis Roofing also offers Collis Cares, which gives homeowners 50% of their repair cost back toward a new roof, so choosing repair first does not mean losing that investment if full replacement becomes necessary later. For property owners navigating the repair-versus-replacement decision on a flat roof, that kind of peace of mind is a meaningful differentiator.
- Notable Clients: Multi-family apartment developers (16+ year recurring relationship), residential homeowners, commercial property managers across Central and Northeast Florida
- Main Focus: Full-service residential and commercial roofing backed by Owens Corning Platinum and GAF certified credentials, flat roof systems including TPO and PVC, and the strongest documented review record in the Longwood market
- Location: 485 Commerce Way, Longwood, FL 32750
- Year Founded: 1994
- Phone: (321) 441-2300
- Flat Roof Systems: TPO, PVC, Flat Membrane (fully adhered and mechanically adhered)
- Certifications: Owens Corning Platinum, GAF Certified
- Review Score: 4.8/5.0 (GuildQuality, 1,558 reviews)
Summary of Online Reviews
Collis Roofing clients describe work completed with "quality and attention to detail... second to none," with one multi-family developer noting they have used the company across "millions of dollars worth of roofing" over 16 years. Homeowners report that the team is "always responsive" even years after installation, and that the process is "professional from the estimate to the final inspection" with consistent communication throughout.
2. All Roofing & Construction, for Broad Commercial Flat Roof System Selection
All Roofing & Construction is a family-owned Longwood contractor based at 1490 W State Rd 434, Suite 108, serving the greater Orlando area with residential and commercial roofing. The company cites three generations of roofing expertise and roughly 50 years of combined team experience across shingle, tile, metal, and flat roofing systems. Their commercial flat roofing range is the broadest on this list, covering TPO, EPDM, BUR, metal, and green roofing systems. They hold certifications from HAAG (storm damage assessment), CertainTeed, GAF, and Owens Corning, and they offer free same-day estimates for local property owners.
The limitation relative to Collis Roofing is documented operating history. All Roofing & Construction carries fewer published reviews than contractors with 30 or more years of continuous local operation. Their system range and multi-manufacturer certification profile are genuine strengths for property owners comparing flat roof materials. However, verifying long-term performance consistency is harder with a shorter documented track record.
- Main Focus: Multi-material commercial flat roofing with HAAG, GAF, CertainTeed, and Owens Corning certifications; strong option for property owners who want to compare TPO, EPDM, and BUR before committing
- Location: 1490 W State Rd 434, Suite 108, Longwood, FL
- Year Founded: 2018
- Flat Roof Systems: TPO, EPDM, BUR, Metal, Green Roofing
- Certifications: HAAG, GAF, CertainTeed, Owens Corning
- Review Score: Growing; positive ratings across available platforms
Summary of Online Reviews
All Roofing & Construction clients describe the company as "professional, respectful to property" with "quality workmanship" throughout the project. Reviewers highlight that the team is "helpful throughout the entire process" and "very responsive to any questions." Although most reviews are positive, some clients note that fewer published long-term operating signals make it harder to assess project consistency relative to contractors with a more established Longwood-area track record.
3. 3MG Roofing, for GAF-Certified Flat Roof Installation with Strong Customer Ratings
3MG Roofing serves Longwood from its Winter Park headquarters and holds GAF GoldElite Commercial Contractor status along with the GAF CoatingsPro Liquid Applied Roofing Contractor designation. Their commercial flat roof range covers TPO, EPDM, PVC, modified bitumen, BUR, and roof coatings. With a 4.8-star average from 359 verified reviews on Directorii, 3MG has strong third-party reputation indicators.
The limitation is proximity. 3MG operates from Winter Park rather than a Longwood-based office, which can affect scheduling responsiveness for Seminole County property owners compared to contractors headquartered in the immediate area. Their flat roof system documentation is strongest for TPO and EPDM; detailed published information on PVC and BUR offerings specific to the Longwood market is less prominent. For property owners who prioritize GAF credentials and a strong third-party rating, 3MG is a credible option.
- Main Focus: GAF Master Elite-certified residential and commercial roofing with documented flat roof system expertise and one of the highest review volumes among Central Florida contractors
- Location: Winter Park, FL (serves Longwood and Seminole County)
- Flat Roof Systems: TPO, EPDM
- Certifications: GAF GoldElite Commercial Contractor, GAF CoatingsPro Liquid Applied Roofing Contractor
- Review Score: 4.8/5.0 (Directorii, 359 reviews)
Summary of Online Reviews
3MG Roofing customers describe the team as "incredibly efficient, polite, and respectful" from start to finish, with reviewers frequently citing "clear communication" and noting that the crew "kept everything clean and organized throughout." Although most reviews are consistently positive, some Longwood-area customers note that scheduling from a Winter Park base adds coordination steps compared to contractors headquartered in Seminole County.
4. Evans Roofing Central Florida, for Established Residential Flat Roof Experience
Evans Roofing has served Central Florida since 1986. Their Longwood address at 1220 N Ronald Reagan Blvd places them directly in the service area, and their 4.8-star average on Best Pick Reports reflects consistent customer satisfaction across residential and commercial work. For flat roofing, they handle flat roofing repair and replacement for residential and smaller commercial properties. A contractor with four decades of Florida storm seasons and code cycles behind them brings a level of field pattern recognition that newer operations simply have not had time to develop.
The limitation is flat roof system range. Evans Roofing's documented membrane options are narrower than the other top-ranked contractors, and their manufacturer certification profile for commercial flat roofing is less prominent. For residential low-slope sections and TPO repair on smaller properties, their long Longwood history and strong review score make them a solid, lower-risk choice. For a full commercial TPO or PVC installation requiring a platinum-tier manufacturer warranty, the certification depth of Collis Roofing makes it the stronger option.
- Main Focus: Residential and commercial roofing with a 40-year Central Florida track record; well-suited for smaller flat roof repair and TPO work on residential properties
- Location: 1220 N Ronald Reagan Blvd, Longwood, FL 32750
- Year Founded: 1986
- Flat Roof Systems: TPO, Asphalt Flat
- Certifications: Florida State Licensed Roofing Contractor
- Review Score: 4.8/5.0 (Best Pick Reports)
Summary of Online Reviews
Evans Roofing clients describe service as "top notch" and note that the team "diagnosed the problem" quickly and resolved it efficiently. Reviewers cite the company's long presence in the Longwood area as a reason for their confidence. Although reviews are generally positive, some clients note that Evans Roofing's narrower flat roof system options mean that complex commercial membrane work may require a second consultation with a more specialized contractor.
5. Northmen Roofing, for Flat Roof Restoration and Liquid Coating Systems
Northmen Roofing is a family-owned Central Florida contractor specializing in tile repair, liquid roof coatings, balcony waterproofing, and flat roof restoration. They hold the American Weatherstar Platinum Contractor designation and the Atlas PRO+ Gold Certification, and they install Tremco and Kemper Systems products backed by no-dollar-limit (NDL) warranties of up to 20 years. Their specialty in liquid coatings is a genuine differentiator for commercial and residential property owners with existing flat roofs that need restoration rather than full tear-off replacement. They serve Longwood and Seminole County from an Altamonte Springs location.
The limitation is scope. Northmen's published materials emphasize restoration, coatings, waterproofing, and specialty repair more than ground-up flat roof replacement. For property owners with an aging but structurally sound flat roof, Northmen's coating and restoration capabilities represent a cost-effective, warranty-backed alternative to immediate replacement.
- Main Focus: Flat roof restoration, liquid coating systems, and balcony waterproofing with NDL manufacturer warranties; best fit when restoration can extend the life of an existing flat roof
- Location: Altamonte Springs, FL (serves Longwood and Seminole County)
- Flat Roof Specialty: Liquid Coatings, Restoration, Waterproofing
- Certifications: American Weatherstar Platinum, Atlas PRO+ Gold, Certified Tremco and Kemper Systems Installer
- Warranty Type: NDL (no-dollar-limit) up to 20 years
- Review Score: Positive reviews across Angi and Houzz
Summary of Online Reviews
Northmen Roofing clients describe service as "friendly, professional and prompt" and praise the team's expertise in specialty roof work, with reviewers noting they would "absolutely recommend" the company. Their review consistency across Angi and Houzz reflects a strong focus on customer communication and craftsmanship. Although most reviews are positive, some clients note that Northmen's specialty focus means larger commercial flat roof replacements are outside their typical project scope.
Spin-Off Rankings
Top 5 Flat Roof Contractors in Longwood, FL for Commercial Flat Roof Replacement
- Collis Roofing
- All Roofing & Construction
- 3MG Roofing
- Evans Roofing Central Florida
- Northmen Roofing
Top 5 Flat Roof Contractors in Longwood, FL for Flat Roof Restoration and Coating
- Northmen Roofing
- Collis Roofing
- 3MG Roofing
- All Roofing & Construction
- Evans Roofing Central Florida
Top 5 Flat Roof Contractors in Longwood, FL for Residential Low-Slope Roofing
- Collis Roofing
- Evans Roofing Central Florida
- All Roofing & Construction
- Northmen Roofing
- 3MG Roofing
Have a roof concern? Call Collis Roofing at (321) 441-2300 or get a free Quick Quote
